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S = 1/2 20√2
S = 10√2
Luas persegi = s x s
= 10√2 x 10√2
= 200 cm²
20cm=s√2
s=20cm/√2
L=s×s
=20cm/√2×20cm/√2
=400cm²/√4
=400cm²/2
=200cm